I work at Wikimedia Deutschland (as an intern from 1 April 2017 until 31 March 2018, as a working student from 1 April 2018 until 31 October 2018, and as a full-time employee since 1 November 2018); my account for that is User:Lucas Werkmeister (WMDE).

If you’re interested in co-maintaining any of them, please let me know:
I’d be very happy to reduce the “bus factor” for these tools by finding other people who can take care of them.
This doesn’t necessarily require strong programming skills:
sometimes you might just need to restart the web service,
and the most common maintenance task for the Lexeme Forms tool, for example,
is to add new templates provided by the community to the list of templates,
which is essentially a transcription task.